[backend] Fix recurring scenario not cleaned

[RomuDeuxfois]

Related issues

• https://github.com/OpenBAS-Platform/openbas/issues/1040

[codecov]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes missing coverage. Please review.

Project coverage is 26.58%. Comparing base (0ab5ff1) to head (7a4958f).
Report is 12 commits behind head on master.

Files	Patch %	Lines
...o/openbas/scheduler/jobs/ScenarioExecutionJob.java	85.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1116      +/-   ##
============================================
- Coverage     26.82%   26.58%   -0.25%     
- Complexity     1057     1106      +49     
============================================
  Files           469      474       +5     
  Lines         11105    11789     +684     
  Branches        562      635      +73     
============================================
+ Hits           2979     3134     +155     
- Misses         8041     8566     +525     
- Partials         85       89       +4     

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